Eragrostis japonica (Thunb.) Trin., Mem. Acad. Imp. Sci. St. Petersbourg, ser. 6, Sci. Math. 1: 405. 1830; Bor, Grasses Burma, Ceyl. Ind. Pak. 509. 1960; Sharma & Khosla, Grasses Punj. and Chandigarh 82. 1989; Kaur & Sharma, Fl. Sirmaur 670. 2004; Singh & Sharma, Fl. Chamba Dist. 784. 2006; Fl. China @ eFloras.org 22: 479; Fl. Pak. @ eFloras.org p. 88; Poa japonica Thunb., Fl. Jap. 51. 1784; Eragrostis diplachnoides Steud., Syn. Pl. Glum. 1: 268. 1854; E. interrupta (Lam.) Doell. in Mart., Fl. Bras. 2(3): 157. 1878; E. interrupta var. diplachnoides (Steud.) Stapf. in Hook. f., Fl. Brit. Ind. 7: 316. 1897; E. interrupta var. tenuissima (Schrad.) Stapf in Hook. f., Fl. Brit. Ind. 7: 316. 1897; Collett, Fl. Siml. ed. 2: 624. 1921 (Reprint 1980).

Annual or short-lived perennial. Culms tufted, simple or branched, erect or geniculate at base, 10-60(-100) cm tall; nodes glabrous. Leaf blades linear, flat or rolled, scabrid, up to 25 cm x 3-5 mm; leaf sheaths glabrous; ligule short, membranous, 0.3-0.5 mm long, truncate, fimbriate. Inflorescence a panicle, 4-30(-50) cm long, some branches ascending close to main axis or spreading and the panicle oblong to ovate, contracted, branched, branches solitary, opposite or whorled, 5-12 cm long, bare towards base. Spikelets purplish, generally towards apex, shortly pedicelled and appressed to the secondary branchlets or longer pedicelled and spreading; pedicels 1-4.5 mm long, scabrid. Spikelets 4-14-flowered, linear oblong to ovate-oblong, 2.5-4(-6) mm long, breaking up from the apex, rachilla fragile. Glumes subequal, narrowly ovate to broadly long-elliptic, hyaline, 1-nerved, acute to obtuse; lower shorter, 0.5 mm long, upper 0.8-1 mm long. Lemmas as long as or longer than the upper glume, 1-1.6 mm long, ovate- oblong, hyaline, obtuse, 3-nerved. Paleas linear- oblong, shorter than lemma, 2-keeled, eciliate. Stamens 2, anthers 0.2-0.3 mm long. Caryopsis broadly oblong or ellipsoid ca. 0.6-0.8 mm x 0.5 mm, brown.

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